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JTBtheSISSY thinks his cobras fast.
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4,002 Posts
Discussion Starter #1
What would cause a rattle in the higher rpms?
 

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Not Fast Enough
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1,932 Posts
That doesnt seem like a rattle, that seems like detonation.
 

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JTBtheSISSY thinks his cobras fast.
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4,002 Posts
Discussion Starter #6
I was looking at buying that built short block in the classifieds and the owner said that the person he bought it from over on NLOC said that towards the end of the track he would hear a rattle. the person selling it says that the main bearings and the rod bearings that hes checked have no discoloration of any kind and the piston skirts have no damage. He also said that the previous owner said that there was good oil pressure. I know its just hear say but I was just curious as to what else it could be. Im thinking that what this guy was hearing was the tune was not correct causing detonation. But i just wanted to hear from you guys that are already built and been through all of this stuff before
 

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Undisputed Re-Post Master
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14,354 Posts
Im thinking that what this guy was hearing was the tune was not correct causing detonation.
Your thinking spot on. :smt023
I would say Detonation without a doubt, especially if its at the higher RPM's.

The notorious marbles in a can sound....:smt013
 

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JTBtheSISSY thinks his cobras fast.
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4,002 Posts
Discussion Starter #8
so with that being said this short block in other words would be fine.?
 

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Not Fast Enough
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1,932 Posts
No it wouldnt. The top of the pistons could be damaged
 

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Innovator of the Bombassani exhaust
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2,428 Posts
+1 on that.....Tune or a faulty Injector can cause detonation. Usually the tune, but in my case it was the injector.
 

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Registered
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3,074 Posts
The tops of the pistons would be lightly pitted from mild detonation - heavier detonation could cause the ring lands to be damaged.

May be only in one cylinder - usually #8 runs the hottest, hence the most prone to detonation.

Bird
 

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JTBtheSISSY thinks his cobras fast.
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4,002 Posts
Discussion Starter #12
alright so lets pray that they all look fine.....
 

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My Dixie Wrecked
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360 Posts
If they price is right....it might be jussss finnee! :smt023
 
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